Preparing nickel hydroxid.



STATES PAE JOHN C. WOODRUFF, F BAYONNE, NEW J E RSEY, ASSIGNOR TO THESOUTHERN COTTON OIL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEWJERSEY.

PREPARING NIGKEL HYDROXID.

No Drawing.

- and thereafter heating the precipitate and the carrier to atemperature of about 500 C. in a current of hydrogen until the nickelhas been reduced to a finely divided condition covering the support.

My invention relates to a method of precipitating hydroxid of nickel byuse of an ammonium compound in such a manner that the precipitate willbe relatively stable and the nickel will not form a solubleammonium-nickel compound.

In carrying out my invention, nitrate of nickel or other nickel oxygensalt is dissolved in sufiieient water to form a dilute solution, whichshould contain about 1% of the crystalline salt, and the solution isthen brought to a temperature in the neighborhood of the boiling point.I have found that satisfactory results are obtained at a temperature ofapproximately 95 C. Suflicient hydroxid of ammonium to theoreticallyprecipitate all the nickel present is then added. In practice I use anammonium-hydroxid solution of a specific gravity of'about 26 Baum, butthis is not an essential detail. The correct amount of a given solutionof the ammonium hydroxid to add to the solution of the nickel salt maybe determined by slowly adding the ammonium to a small quantity of thenickel solution under the aboveconditions, and noting the point at whichthe precipitate commences to redissolve. A slightly smaller proportionof the ammonium compound should then be Copies of this patent may beobtained for Specification of Letters Patent.

five cents each,

Patented June 15, 1915.

Application filed January 29, 1913. Serial No. 744,837.

it may be applied to the support while still in the solution in which itwas formed, or the supernatant liquid may in the manner already known tothe art be decanted ofi". While this manner of applying the precipitateto the support is not part of my invention, I find that by the use of avery dilutesolution of the nickel salt from which the precipitate isformed, practically all of the impurities will be removed when thesupernatant liquid is decanted ofi, whether before or after theapplication of the precipitate to the support, thus eliminating thenecessity of washing the catalyzer The precipitate and the support arethen dried to expel water and are heated to a temperature of about 500C. in a current of hydropresent.

JOHN C. WOODRUFF. Witnesses:

H. E. Lone, G. S. HANSEN.

strengths of soluby addressing the Commissioner 0! Patents,

Washington, I). G.

